Schmalzer. Science for the People. University of Massachusetts Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSchmalzer. Science for the People. University of Massachusetts Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSchmalzer. Science for the People. University of Massachusetts Press.
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